Mounting for portable drill



May 3, 1966 .1 H. ALEXANDER ETAL 3,

MOUNTING FOR PORTABLE DRILL 2 Sheets-Sheet 1 Filed June 24, 1963 A tlorney;

2 Sheets-Sheet 2 J. H. ALEXANDER ETAL MOUNTING FOR I ORTABLE DRILL A ttorney United States Patent 3,248,974 MGUNTING FOR PORTABLE DRILL John Herbert Alexander and Hubert Alexander, Newcastle, Northern Ireland, assignors to G. E. Sirnm (Engineering) Limited, Shefiield, England Filed June 24, 1963, Ser. No. 239,882 3 Claims. (Cl. 7733.5)

This invention relates to a mounting for an electric drill or compressed air drill, and is concerned with the provision of improved means for effecting a feed movement of the power-driven drill along the mounting.

According to the present invention, a mounting for a power-driven drill of the kind referred to comprises an elongated support slide, a carrier slidable along the support slide and adapted to receive the drill with the axis of the latter parallel to the support slide, and manually-actuated hydraulic mechanism for effecting movement of the carrier along the support slide.

The hydraulic mechanism may consist of at least one hydraulic ram disposed parallel to the support slide and forming a connection of adjustable length between the slide and the carrier, and a manually-operated pump mov able with the carrier and in operative connection with the hydraulic ram.

Preferably, the pump is provided with a bypass and has its plunger movable in a return stroke to an extent to open the by-pass to open the hydraulic ram to exhaust when the pump is not being manually actuated.

The invention will now be further described with reference to the accompanying drawings, in which FIGURE 1 is a perspective view of one form of a drill mounting, complete with an electric drill, arranged for vertical operation of the drill;

FIGURE 2 is a sectional view of a pump used in FIGURE 1;

FIGURE 3 is a sectional view of a hydraulic ram used in FIGURE 1; and

FIGURE 4 is a perspective view of a modified form of a drill mounting, complete with an electric drill, also arranged for vertical operation of the drill.

In FIGURE 1, an electric drill of the portable type is shown fitted to a mounting 11 consisting mainly of a work-supporting base 12 and a support slide 13 of circular section extending upwardly from the base, together with a sleeve 14 movable along the slide 13, and clamps 15 to hold the body of the drill to the sleeve 14, the sleeve and clamps constituting a carrier for the drill 10, with the axis of the drill parallel to the slide 13. The operative end of the drill is directed towards the base 12, for application of its toolhere shown as a twist drill 16-to a workpiece supported by the base. The drill is set in motion from the usual control handle 17.

An arm 18 extends from the end of the slide 13 remote from the base 12 and is adjustable along the slide, and a spring 19 serves to suspend the drill 10 and its carrier from the arm and ordinarily draws these towards the top of the slide 13.

An oil reservoir 20 is secured to the carrier sleeve 14 by a clamp 21, and a pump 22 supplied from the reservoir is mounted on the body of the drill 10, in the position normally occupied by a second handle opposite to the control handle 17. A sleeve 23 extends from the pump body to carry a lever handle 24 capable of being gripped by one hand of the user to actuate the pump. A hydraulic ram 25 has its cylinder 33 (FIGURE 3) carried by the arm 18 and its piston rod 36 in bearing connection with the adjacent end of the body of the drill 10, so that the ram forms an adjustable connection between the slide 13 and the drill 10 and the drill carrier. A pipe 26 connects the reservoir 20 to the pump inlet, and a pipe 27 connects the pump outlet to the ram cylinder.

3,248,974 Fatented May 3, 1966 ice The pump (FIGURE 2) has a plunger 28, co-axial with the sleeve of FIGURE 1, and a spring 28X (FIGURE 1) in the sleeve 23 provides for the return stroke of the plunger 28 from the position shown in FIGURE 2, i.e., from the end of its operative stroke ellected by gripping the lever 24. The pump has spring-loaded delivery and inlet valves 29, 30. A by-pass 32 extends from above the valve 29 to below the valve 30, but is interrupted at a port 31 by the plunger 28 itself when the plunger is given an operating stroke to actuate the ram.

As shown by FIGURE 3, the piston 34 in the ram cylinder 25 has a hollow piston rod 36, which has a branch 35 to which the pipe 27 is connected for the pump 22 to deliver oil to the cylinder.

When the lever handle 24 is gripped, the sleeve 23 serving as a further grip, it causes the pump plunger 28 to close the port 31 in the by-pass 32 and to pump oil to the ram cylinder 25 above the piston 34. Consequently, the piston rod 36 forces the drill 10 and the carrier sleeve downwardly to an amount and at a rate dependent on the amount and rate of movement of the lever handle 24. The pressure with which the drill 10 applies the twist drill 16 to the workpiece can be sensitively controlled by the manual pressure applied to the lever handle 24. The spring 19 is extended by the downward movement of the drill 10.

When the lever handle 24 is no longer gripped, the plunger 28 is withdrawn by the spring 28X in the sleeve 23, to expose the port 31. This allows the cylinder 23 to exhaust to the reservoir 20 as the spring 19 raises the drill 10 and the piston rod 36.

In the modified form of mounting shown in FIGURE 4, parts similar to those appearing in FIGURES 1 to 3 are designated by the same reference numerals with the suflix A added. The hydraulic ram 25A is secured to the support slide 13A by an adjustable clamp 37 and the top of the cylinder carries a cross-bar 38, which is connected by a pair of springs 39 to the upper of two clamps 15A by which the drill 10A is secured to the carrier sleeve 14A. The oil reservoir 20A is secured to the sleeve 14A by a strap 40, and the pump 22A is secured directly to the sleeve 14A by a clamp 41, with an actuating lever handle 24A directly mounted on the pump itself, alongside a hand grip also on the pump. The construction of the pump 22A and the ram 25A and the whole operation are essentially the same as described with reference to FIG- URES l to 3.

The construction is not limited to the use of one bydraulic ram only. Thus, two rams may be arranged sideby-side and operated simultaneously by the pump.

With the base 12A resting against any suitable support, the mounting may be held steady by one hand of the user, applied for example to the free end of the slide 13A, as shown at the top of FIGURE 4. Although in both FIGURE 1 and FIGURE 3, the mounting is shown in position for vertical operation of the electric drill, operation may also be in a horizontal or inclined direction, if the oil reservoir 20 and the connection to it of the pipe 26 are appropriately located to maintain the supply to the inlet of the pump in any operating position. The position of the actuating lever handle may be adjustable in accordance with the operating position. The slide 13 is not necessarily of circular section, the sleeve 14 as used with a circular slide being replaced by a sliding member of a form appropriate to the section of a non-circular slide.

What we claim is:

1. A mounting for a power-driven drill, the mounting comprising a support slide, a drill-carrier movable along the slide, a spring for moving the carrier in one direction along the slide, and self-contained hydraulic mechanism for effecting movement of the carrier in another direction along the slide, the mechanism including a reservoir and a manually-actuated -plunger pump mounted on the carrier, with an inlet connection between the reservoir and the pump, together with a cylinder and ram, with a delivery connection between the pump and the cylinder, a bypass connection being provided between the delivery and the inlet connections, and the pump having its plunger serve as a closure for the bypass during a delivery stroke of the plunger but allowing the bypass to open to allow the ram cylinder to exhaust on a return stroke of the plunger.

2. A mounting for a power-driven drill, the mounting comprising a support slide, a drill-carrier movable along the slide, a spring for moving the carrier in one direction along the slide, a pump cylinder mounted on the carrier, a plunger in the cylinder, manually-actuated means for effecting a-delivery stroke of the plunger in its cylinder, a spring for effecting a return stroke of the plunger, an oil reservoir and a hydraulic ram connected respectively to inlet and outlet connections of the pump, a by-pass from the outlet connection to the inlet connection through the cylinder itself but intercepted by the pump plunger in the delivery stroke of the plunger, the by-pass being opened on the spring-urged return stroke of the plunger, and the hydraulic ram forming a connection between the carrier and the support slide for pump-controlled movement of the carrier in a direction opposite to the spring-urged movement of the carrier.

3. In combination with a power-driven drill, hydraulic means for exerting pressure on the drill in the direction of the axis or" the drilling tool and biasing means for exerting pressure on the drill in the opposite direction, said hydraulic means comprising an hydraulic reservoir, a plunger pump having an inlet and an outlet, and an hydraulic ram connected to said drill, conduits connecting said reservoir to said pump inlet and said pump outlet to said ram respectively, a by-pass between said pump inlet and out let, said plunger serving as a closure for said by-pass during a delivery stroke of the plunger pumping hydraulic fluid from the pump into the ram but allowing the by-pass to open allowing the ram to exhaust said hydraulic fluid on a return stroke of the plunger.

References Cited by the Examiner UNITED STATES PATENTS 2,196,208 4/1940 Gardner 77-33.5 2,643,088 6/1953 Hornack 7733.5 X 3,024,671 3/1962 Madonna 7733.5

WILLIAM W. DYER, JR., Primary Examiner.

FRANCIS S. HUSAR, Examiner. 

1. A MOUNTING FOR A POWER-DRIVEN DRILL, THE MOUNTING COMPRISING A SUPPORT SLIDE, A DRILL-CARRIER MOVABLE ALONG THE SLIDE, A SPRING FOR MOVING THE CARRIER IN ONE DIRECTION ALONG THE SLIDE, AND SELF-CONTAINED HYDRAULIC MECHANISM FOR EFFECTING MOVEMENT OF THE CARRIER IN ANOTHER DIRECTION ALONG THE SLIDE, THE MECHANISM INCLUDING A RESERVOIR AND A MANUALLY-ACTUATED PLUNGER PUMP MOUNTED ON THE CARRIER, WITH AN INLET CONNECTION BETWEEN RESERVOIR AND THE PUMP, TOGETHER WITH A CYLINDER AND RAM, WITH A DELIVERY CONNECTION BETWEEN THE PUMP AND THE CYLINDER, A BY-PASS CONNECTION BEING PROVIDED BETWEEN THE DELIVERY AND THE 